Changing notebook uuid algorithm to preserver across sessions.

IPython/frontend/html/notebook/notebookapp.py

@@ -220,6 +220,7 b' class IPythonNotebookApp(BaseIPythonApplication):'
             config=self.config, log=self.log, kernel_argv=self.kernel_argv
         )
         self.notebook_manager = NotebookManager(config=self.config, log=self.log)
+        self.notebook_manager.list_notebooks()
 
     def init_logging(self):
         super(IPythonNotebookApp, self).init_logging()

IPython/frontend/html/notebook/notebookmanager.py

@@ -67,7 +67,8 b' class NotebookManager(LoggingConfigurable):'
 
     def new_notebook_id(self, name):
         """Generate a new notebook_id for a name and store its mappings."""
-        notebook_id = unicode(uuid.uuid4())
+        notebook_id = unicode(uuid.uuid5(uuid.NAMESPACE_URL,
+            'file://'+self.get_path_by_name(name).encode('utf-8')))
         self.mapping[notebook_id] = name
         self.rev_mapping[name] = notebook_id
         return notebook_id